The ATTO Celerity FC-642E leverages two next-generation storage technologies – PCIe 4. 0 interconnect and Gen 7 Fibre Channel to provide an advanced storage connectivity solution with high performance, intelligence and scalability. Unleash the full potential of your storage infrastructure with high-performance Fibre Channel HBAs from ATTO. Engineered to give you the edge, Celerity HBAs. ATTO Celerity Fibre Channel HBAs deliver the fastest data throughput available for today's most demanding Storage Area Network environments. Included with all ATTO HBAs are.